diff --git a/semantic-diff.cabal b/semantic-diff.cabal
index 84878a1d5..6936f11bd 100644
--- a/semantic-diff.cabal
+++ b/semantic-diff.cabal
@@ -149,6 +149,7 @@ test-suite test
                      , RangeSpec
                      , Source.Spec
                      , TermSpec
+                     , TOCSpec
                      , Test.Hspec.LeanCheck
   build-depends:       array
                      , base
diff --git a/src/Renderer/TOC.hs b/src/Renderer/TOC.hs
index 8e77e8a3f..2ee83a2e0 100644
--- a/src/Renderer/TOC.hs
+++ b/src/Renderer/TOC.hs
@@ -1,10 +1,11 @@
 {-# LANGUAGE ScopedTypeVariables #-}
-module Renderer.TOC (toc) where
+module Renderer.TOC (toc, diffTOC, JSONSummary(..), Summarizable(..)) where
 
 import Category as C
 import Data.Aeson
 import Data.Functor.Both hiding (fst, snd)
 import qualified Data.Functor.Both as Both
+import Data.Text (toLower)
 import Data.Record
 import Diff
 import Info
@@ -17,7 +18,6 @@ import Source hiding (null)
 import Syntax as S
 import Term
 import Patch
-import Unsafe (unsafeHead)
 
 data JSONSummary = JSONSummary { info :: Summarizable }
                  | ErrorSummary { error :: Text, errorSpan :: SourceSpan }
@@ -64,13 +64,24 @@ toc blobs diff = TOCOutput $ Map.fromList [
     summaries = diffTOC blobs diff
 
 diffTOC :: (StringConv leaf Text, DefaultFields fields) => Both SourceBlob -> SyntaxDiff leaf fields -> [JSONSummary]
-diffTOC blobs diff = do
-  noDupes <- removeDupes (diffToTOCSummaries (source <$> blobs) diff)
-  toJSONSummaries noDupes
+diffTOC blobs diff = removeDupes (diffToTOCSummaries (source <$> blobs) diff) >>= toJSONSummaries
   where
     removeDupes :: [TOCSummary DiffInfo] -> [TOCSummary DiffInfo]
-    removeDupes [] = []
-    removeDupes xs = (fmap unsafeHead . List.groupBy (\a b -> parentInfo a == parentInfo b)) xs
+    removeDupes = foldl' go []
+      where
+        go xs x | (_, _ : _) <- find exactMatch x xs = xs
+                | (front, existingItem : back) <- find similarMatch x xs =
+                   let
+                     (Summarizable category name sourceSpan _) = parentInfo existingItem
+                     replacement = x { parentInfo = Summarizable category name sourceSpan "modified" }
+                   in
+                     front <> (replacement : back)
+                | otherwise = xs <> [x]
+        find p x = List.break (p x)
+        exactMatch a b = parentInfo a == parentInfo b
+        similarMatch a b = case (parentInfo a, parentInfo b) of
+          (Summarizable catA nameA _ _, Summarizable catB nameB _ _) -> catA == catB && toLower nameA == toLower nameB
+          (_, _) -> False
 
     diffToTOCSummaries :: (StringConv leaf Text, DefaultFields fields) => Both Source -> SyntaxDiff leaf fields -> [TOCSummary DiffInfo]
     diffToTOCSummaries sources = para $ \diff ->
@@ -155,10 +166,15 @@ toTermName :: forall leaf fields. DefaultFields fields => Int -> Source -> Synta
 toTermName parentOffset parentSource term = case unwrap term of
   S.Function identifier _ _ _ -> toTermName' identifier
   S.Method identifier Nothing _ _ _ -> toTermName' identifier
-  S.Method identifier (Just receiver) _ _ _ -> toTermName' receiver <> "." <> toTermName' identifier
+  S.Method identifier (Just receiver) _ _ _ -> case unwrap receiver of
+    S.Indexed [receiverParams] -> case unwrap receiverParams of
+      S.ParameterDecl (Just ty) _ -> "(" <> toTermName' ty <> ") " <> toTermName' identifier
+      _ -> toMethodNameWithReceiver receiver identifier
+    _ -> toMethodNameWithReceiver receiver identifier
   _ -> toText source
   where
     source = Source.slice (offsetRange (range term) (negate parentOffset)) parentSource
+    toMethodNameWithReceiver receiver name = toTermName' receiver <> "." <> toTermName' name
     offset = start (range term)
     toTermName' :: SyntaxTerm leaf fields -> Text
     toTermName' = toTermName offset source
diff --git a/test/Spec.hs b/test/Spec.hs
index 71480f5b5..66c1283f8 100644
--- a/test/Spec.hs
+++ b/test/Spec.hs
@@ -12,6 +12,7 @@ import qualified PatchOutputSpec
 import qualified RangeSpec
 import qualified Source.Spec
 import qualified TermSpec
+import qualified TOCSpec
 import Test.Hspec
 
 main :: IO ()
@@ -27,3 +28,4 @@ main = hspec . parallel $ do
   describe "Range" RangeSpec.spec
   describe "Source" Source.Spec.spec
   describe "Term" TermSpec.spec
+  describe "TOC" TOCSpec.spec
diff --git a/test/TOCSpec.hs b/test/TOCSpec.hs
new file mode 100644
index 000000000..644b32d9d
--- /dev/null
+++ b/test/TOCSpec.hs
@@ -0,0 +1,75 @@
+{-# LANGUAGE DataKinds #-}
+module TOCSpec where
+
+import Category
+import Data.Functor.Both
+import Data.RandomWalkSimilarity
+import Data.Record
+import Data.These
+import Diff
+import Diffing
+import Info
+import Interpreter
+import Parse
+import Patch
+import Prologue hiding (fst, snd)
+import Renderer.TOC
+import Source
+import Syntax
+import Test.Hspec (Spec, describe, it, parallel)
+import Test.Hspec.Expectations.Pretty
+
+spec :: Spec
+spec = parallel $ do
+  describe "tocSummaries" $ do
+    it "blank if there are no methods" $
+      diffTOC blobs blankDiff `shouldBe` [ ]
+
+    it "dedupes changes in same parent method" $ do
+      sourceBlobs <- blobsForPaths (both "test/corpus/toc/javascript/dupParent.A.js" "test/corpus/toc/javascript/dupParent.B.js")
+      diff <- testDiff sourceBlobs
+      diffTOC sourceBlobs diff `shouldBe` [ JSONSummary $ InSummarizable Category.Function "myFunction" (sourceSpanBetween (1, 1) (6, 2)) ]
+
+    it "dedupes similar methods" $ do
+      sourceBlobs <- blobsForPaths (both "test/corpus/toc/javascript/erroneousDupMethod.A.js" "test/corpus/toc/javascript/erroneousDupMethod.B.js")
+      diff <- testDiff sourceBlobs
+      diffTOC sourceBlobs diff `shouldBe` [ JSONSummary $ Summarizable Category.Function "performHealthCheck" (sourceSpanBetween (8, 1) (29, 2)) "modified" ]
+
+testDiff :: Both SourceBlob -> IO (Diff (Syntax Text) (Record '[Cost, Range, Category, SourceSpan]))
+testDiff sourceBlobs = do
+  terms <- traverse (fmap (defaultFeatureVectorDecorator getLabel) . parser) sourceBlobs
+  pure $! stripDiff (diffTerms' terms sourceBlobs)
+  where
+    parser = parserWithCost (path . fst $ sourceBlobs)
+    diffTerms' terms blobs = case runBothWith areNullOids blobs of
+      (True, False) -> pure $ Insert (snd terms)
+      (False, True) -> pure $ Delete (fst terms)
+      (_, _) -> runBothWith (diffTerms construct compareCategoryEq diffCostWithCachedTermCosts) terms
+    areNullOids a b = (hasNullOid a, hasNullOid b)
+    hasNullOid blob = oid blob == nullOid || Source.null (source blob)
+    construct (info :< syntax) = free (Free ((setCost <$> info <*> sumCost syntax) :< syntax))
+    sumCost = fmap getSum . foldMap (fmap Sum . getCost)
+    getCost diff = case runFree diff of
+      Free (info :< _) -> cost <$> info
+      Pure patch -> uncurry both (fromThese 0 0 (unPatch (cost . extract <$> patch)))
+
+blobsForPaths :: Both FilePath -> IO (Both SourceBlob)
+blobsForPaths paths = do
+  sources <- sequence $ readAndTranscodeFile <$> paths
+  pure $ SourceBlob <$> sources <*> pure mempty <*> paths <*> pure (Just Source.defaultPlainBlob)
+
+
+sourceSpanBetween :: (Int, Int) -> (Int, Int) -> SourceSpan
+sourceSpanBetween (s1, e1) (s2, e2) = SourceSpan (SourcePos s1 e1) (SourcePos s2 e2)
+
+arrayInfo :: Record '[Category, Range, SourceSpan]
+arrayInfo = ArrayLiteral :. Range 0 3 :. sourceSpanBetween (1, 1) (1, 5) :. Nil
+
+literalInfo :: Record '[Category, Range, SourceSpan]
+literalInfo = StringLiteral :. Range 1 2 :. sourceSpanBetween (1, 2) (1, 4) :. Nil
+
+blankDiff :: Diff (Syntax Text) (Record '[Category, Range, SourceSpan])
+blankDiff = free $ Free (pure arrayInfo :< Indexed [ free $ Pure (Insert (cofree $ literalInfo :< Leaf "\"a\"")) ])
+
+blobs :: Both SourceBlob
+blobs = both (SourceBlob (fromText "[]") nullOid "a.js" (Just defaultPlainBlob)) (SourceBlob (fromText "[a]") nullOid "b.js" (Just defaultPlainBlob))
diff --git a/test/corpus/toc/javascript/dupParent.A.js b/test/corpus/toc/javascript/dupParent.A.js
new file mode 100644
index 000000000..1f3e01f84
--- /dev/null
+++ b/test/corpus/toc/javascript/dupParent.A.js
@@ -0,0 +1,3 @@
+function myFunction() {
+  return 0;
+}
diff --git a/test/corpus/toc/javascript/dupParent.B.js b/test/corpus/toc/javascript/dupParent.B.js
new file mode 100644
index 000000000..3145f834f
--- /dev/null
+++ b/test/corpus/toc/javascript/dupParent.B.js
@@ -0,0 +1,6 @@
+function myFunction() {
+  if (true) {
+    console.log();
+  }
+  return 1;
+}
diff --git a/test/corpus/toc/javascript/erroneousDupMethod.A.js b/test/corpus/toc/javascript/erroneousDupMethod.A.js
new file mode 100644
index 000000000..251e61ef0
--- /dev/null
+++ b/test/corpus/toc/javascript/erroneousDupMethod.A.js
@@ -0,0 +1,38 @@
+/* @flow */
+
+import $ from '../jquery'
+import cast from '../typecast'
+import {on} from 'delegated-events'
+import {submit} from '../form'
+
+let allowSubmit = false
+
+function performHealthcheck() {
+  const repoName = cast(document.getElementById('showcase_item_name_with_owner'), HTMLInputElement).value
+  const submitButton = cast(document.getElementById('submit'), HTMLButtonElement)
+  const hiddenForm = cast(document.getElementsByClassName('js-submit-health-check')[0], HTMLFormElement)
+  const targetRepoName = cast(document.getElementById('repo_name'), HTMLInputElement)
+  document.getElementById("js-health").innerHTML = "Performing health check..."
+  targetRepoName.value = repoName
+  submitButton.disabled = false
+  allowSubmit = true
+  submit(hiddenForm)
+}
+
+on('submit', '#new_showcase_item', function(e) {
+  if (!allowSubmit) { e.preventDefault() }
+})
+
+$(document).on('ajaxSuccess', '.js-health', function(event, xhr, settings, data) {
+  this.innerHTML = data
+})
+
+on('focusout', '#showcase_item_name_with_owner', function() {
+  performHealthcheck()
+})
+
+on('focusin', '#showcase_item_body', function() {
+  if (cast(document.getElementById('showcase_item_name_with_owner'), HTMLInputElement).type === 'hidden') {
+    performHealthcheck()
+  }
+})
diff --git a/test/corpus/toc/javascript/erroneousDupMethod.B.js b/test/corpus/toc/javascript/erroneousDupMethod.B.js
new file mode 100644
index 000000000..b91cdd649
--- /dev/null
+++ b/test/corpus/toc/javascript/erroneousDupMethod.B.js
@@ -0,0 +1,45 @@
+/* @flow */
+
+import cast from '../typecast'
+import {changeValue} from '../form'
+import {fetchSafeDocumentFragment} from '../fetch'
+import {observe} from '../observe'
+
+function performHealthCheck(container, repoName) {
+  const formCheck = cast(document.querySelector('.js-repo-health-check'), HTMLFormElement)
+  const nameToCheck = cast(formCheck.querySelector('.js-repo-health-name'), HTMLInputElement)
+  nameToCheck.value = repoName
+
+  const completedIndicator = cast(container.querySelector('.js-repo-health-check-completed'), HTMLInputElement)
+  changeValue(completedIndicator, '')
+  container.classList.remove('d-none')
+  container.classList.add('is-loading')
+
+  return fetchSafeDocumentFragment(document, formCheck.action, {
+    method: 'POST',
+    body: new FormData(formCheck),
+  }).then(html => {
+    const results = cast(container.querySelector('.js-repo-health-results'), HTMLElement)
+    results.innerHTML = ''
+    results.appendChild(html)
+
+    container.classList.remove('is-loading')
+    changeValue(completedIndicator, '1')
+  })
+}
+
+observe('.js-repo-health', function(container: HTMLElement) {
+  const form = cast(container.closest('form'), HTMLFormElement)
+  const repoInput = cast(form.querySelector('.js-repo-name'), HTMLInputElement)
+
+  if (repoInput.type === 'hidden') {
+    const description = cast(form.querySelector('.js-comment-field'), HTMLTextAreaElement)
+    description.addEventListener('focus', () => {
+      performHealthCheck(container, repoInput.value)
+    })
+  } else {
+    repoInput.addEventListener('change', () => {
+      performHealthCheck(container, repoInput.value)
+    })
+  }
+})